diff --git a/zh-cn/application-dev/reference/apis/js-apis-request.md b/zh-cn/application-dev/reference/apis/js-apis-request.md
index 9b99db50d7f576e477d0e574093320c802e07177..4103f7bd6761f9b2e267ba9de08a1fbd313e11cc 100644
--- a/zh-cn/application-dev/reference/apis/js-apis-request.md
+++ b/zh-cn/application-dev/reference/apis/js-apis-request.md
@@ -362,7 +362,7 @@ on(type: 'headerReceive', callback:  (header: object) => void): void
         console.info("upOnComplete taskState:" + JSON.stringify(taskStates[i]));
     }
   };
-  uploadTask.on('complete', upComplete);
+  uploadTask.on('complete', upCompleteCallback);
 
   let upFailCallback = (taskStates) => {
     for (let i = 0; i < taskStates.length; i++ ) {
@@ -393,6 +393,9 @@ off(type:  'progress',  callback?: (uploadedSize: number, totalSize: number) =&g
 **示例：**
 
   ```js
+  let upProgressCallback = (uploadedSize, totalSize) => {
+      console.info('Upload delete progress notification.' + 'totalSize:' + totalSize + 'uploadedSize:' + uploadedSize);
+  };
   uploadTask.off('progress', upProgressCallback);
   ```
 
@@ -417,6 +420,9 @@ off(type: 'headerReceive', callback?: (header: object) =&gt; void): void
 **示例：**
 
   ```js
+  let headerCallback = (header) => {
+      console.info('Upload delete headerReceive notification.' + 'header:' + JSON.stringify(header));
+  };
   uploadTask.off('headerReceive', headerCallback);
   ```
 
@@ -440,8 +446,20 @@ off(type: 'headerReceive', callback?: (header: object) =&gt; void): void
 **示例：**
 
   ```js
+  let upCompleteCallback = (taskStates) => {
+    console.info('Upload delete complete notification.');
+    for (let i = 0; i < taskStates.length; i++ ) {
+        console.info('taskState:' + JSON.stringify(taskStates[i]));
+    }
+  };
   uploadTask.off('complete', upCompleteCallback);
 
+  let upFailCallback = (taskStates) => {
+    console.info('Upload delete fail notification.');
+    for (let i = 0; i < taskStates.length; i++ ) {
+      console.info('taskState:' + JSON.stringify(taskStates[i]));
+    }
+  };
   uploadTask.off('fail', upFailCallback);
   ```
 
@@ -830,10 +848,10 @@ on(type: 'progress', callback:(receivedSize: number, totalSize: number) =&gt; vo
 **示例：**
 
   ```js
-  let progresCallbanck = (receivedSize, totalSize) => {
+  let progresCallback = (receivedSize, totalSize) => {
       console.info("download receivedSize:" + receivedSize + " totalSize:" + totalSize);
   };
-  downloadTask.on('progress', progresCallbanck);
+  downloadTask.on('progress', progresCallback);
   ```
 
 
@@ -857,7 +875,10 @@ off(type: 'progress', callback?: (receivedSize: number, totalSize: number) =&gt;
 **示例：**
 
   ```js
-  downloadTask .off('progress',progresCallbanck);
+  let progresCallback = (receivedSize, totalSize) => {
+      console.info('Download delete progress notification.' + 'receivedSize:' + receivedSize + 'totalSize:' + totalSize);
+  };
+  downloadTask.off('progress', progresCallback);
   ```
 
 
@@ -908,6 +929,9 @@ off(type: 'complete'|'pause'|'remove', callback?:() =&gt; void): void
 **示例：**
 
   ```js
+  let completeCallback = () => {
+      console.info('Download delete complete notification.');
+  };
   downloadTask.off('complete', completeCallback);
   ```
 
@@ -965,6 +989,9 @@ off(type: 'fail', callback?: (err: number) =&gt; void): void
 **示例：**
 
   ```js
+  let failCallback = (err) => {
+      console.info('Download delete fail notification.' + 'err:' + err);
+  };
   downloadTask.off('fail', failCallback);
   ```